Here's a nice simple demonstration of ingenuity and efficiency. MindKits customer Frits Schouten modified his outdoor light to use LED lighting. Pretty awesome to see the results. Lots more light at less than half the power.
The first image is the standard 10W halogen lightbulb. The four LEDs wired in 2x2 parallel. They are directly connected to the 6V via the original lamp holder (2 pin based)
In the second image you can see the difference the LED lighting made.
Note: with the night photos Frits used - for both photos - a 25 seconds exposure with an Av of 6.3
You van verify that by looking at the exif data of the photos.
The LEDs are connected without resistor because the reverse voltage of the leds is 3.4V and with two in series they will never blow up, drawing about 350mA all up and drawing just over 4W.
Tom Sampson commented on 27-Jan-2012 12:33 PM
